package com.sky.service.impl;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {


    public static final String WX_LOGIN_URL= "https://api.weixin.qq.com/sns/jscode2session";

    @Resource
    private WeChatProperties weChatProperties;

    @Resource
    private UserMapper userMapper;

    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获取当前用户的openid
        String openid = getOpenid(userLoginDTO);

        //判断openid是否为空，如果空表示登录失败，抛出登录异常
        if(openid == null){
            throw new LoginFailedException("微信登录失败");
        }

        //判断当前用户是否为新用户，如果是新用户，自动完成注册
        User user = userMapper.getByOpenid(openid);
        if(user == null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        //登录成功，返回用户对象
        return user;
    }

    private String getOpenid(UserLoginDTO userLoginDTO) {
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN_URL, map);

        log.info("微信登录返回的json数据：{}", json);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
